How I play an animation while pressing on a key on my keyboard?

local player = game.Players.LocalPlayer

local mouse = player:GetMouse()

function onkey(key)

if key == "b" -- change to whatever key you want to trigger the function--

then

    player.Character.Humanoid.WalkSpeed = 16 * 2.5

        endend

mouse.KeyDown:connect(onkey)

local player = game.Players.LocalPlayer

repeat wait() until player.Character

local character = player.Character

local animation = Instance.new("Animation")

animation.AnimationId = "1898738866"

local track = character:FindFirstChild("Humanoid"):LoadAnimation(animation) UIS.InputBegan:connect(function(input, proc)

if not proc then -- So that it wont fire when the player is chatting

    if input.KeyCode == Enum.KeyCode.B then --We will see if the key pushed is "B"

        track:Play()

        character.Humanoid.WalkSpeed = 16 * 2.5

    end

end

end) This is what I've tried but it hasn't worked. I put it in workspace. Please tell me what I did wrong!!